6.13. References

"Just the FAQs: Coping with
Scoping," an article by Mark-Jason Dominus
about how Perl handles variables and namespaces, and the difference
between use vars( ) and my( ):
http://www.plover.com/~mjd/perl/FAQs/Namespaces.html.

It's important to know how to perform
exception
handling in Perl code. Exception handling is a general Perl
technique; it's not mod_perl-specific. Further
information is available in the documentation for the following
modules:

Error.pm, by Graham Barr.

Exception::Class and
Devel::StackTrace, by Dave Rolsky.

Try.pm, by Tony Olekshy, available at http://www.avrasoft.com/perl6/try6-ref5.txt.

There is also a great deal of information concerning error handling
in the mod_perl online documentation (e.g., http://perl.apache.org/docs/general/perl_reference/perl_reference.html).